Research indicates that executive functioning is a multidimensional construct in school-age children (Korkman, Kemp, & Kirk, 2001; Welsh & Pennington, 1988). Executive dysfunction is primarily associated with Attention-Deficit/Hyperactivity Disorder (ADHD; Barkley, 2003). This association is because of a `core' deficit in inhibitory control found in ADHD-Combined Type (ADHD-C; Barkley, 1997); however, inhibitory control is only one component of executive functioning. Children with dyslexia are thought to demonstrate a `core' deficit in phonological awareness (Wagner & Torgesen, 1987). However, little consideration is given to the potential executive deficits that may exist in children with dyslexia. Therefore, the purpose of the present study was to test for convergent and divergent executive functioning deficits in 8-to 12-year-old children with ADHD or dyslexia using a comprehensive battery of executive measures. On neuropsychological measures when intelligence (IQ) was used as a covariate, the ADHD group did not demonstrate divergent deficits while children with dyslexia had deficits in nonverbal fluency. No convergent deficits were found. When IQ was not used as a covariate, children with ADHD and dyslexia were found to have convergent deficits in nonverbal fluency and problem-solving. Furthermore, children with dyslexia had divergent deficits in processing speed and phonological short-term storage. On a behavioral rating measure (BRIEF) children with ADHD-C and Attention-Deficit/Hyperactivity Disorder-Predominantly Inattentive (ADHD-PI) had convergent deficits in behavioral regulation while children with ADHD-C, ADHD-PI, and dyslexia were all rated more poorly on a metacognitive factor compared to controls. An exploratory analysis was conducted to further understand convergent and divergent abilities on the Behavior Rating Inventory of Executive Functioning (BRIEF). Results indicated that ADHD-C and ADHD-PI shared deficits on the metacognitive subscales, but that ADHD-C demonstrated divergent deficits on subscales of behavioral regulation, particularly Inhibit, and on a Monitor subscale. Children with dyslexia were rated comparably to controls on all subscales of the BRIEF. Overall, it was found that executive deficits were not exclusive to ADHD. Rather, children with ADHD and dyslexia demonstrated convergent and divergent executive functioning deficits. The convergent deficits warrant further investigation as to whether they are a source of the comorbidity between dyslexia and ADHD. The limitations of the present study, recommendations for future directions, and clinical implications are discussed.

abstract: This study examines cognitive and motor function in typical older adults following acute exercise. Ten older adults (Mage = 65.1) completed a single session of assisted cycling (AC) (i.e., exercise accomplished through the use of a motor), voluntary cycling (VC) (self-selected cadence), and a no cycling (NC) control group. These sessions were randomized and separated by approximately one week. Both ACT and VC groups rode a stationary bicycle for 30-minutes each session. These sessions were separated by at least two days. Participants completed cognitive testing that assessed information processing and set shifting and motor testing including gross and fine motor performance at the beginning and at the end of each session. Consistent with our hypothesis concerning manual dexterity, the results showed that manual dexterity improved following the ACT session more than the VC or NC sessions. Improvements in set shifting were also found for the ACT session but not for the VC or NC sessions. The results are interpreted with respect to improvements in neurological function in older adults following acute cycling exercise. These improvements are balance, manual dexterity, and set shifting which have a positive effects on activities of daily living; such as, decrease risk of falls, improve movements like eating and handwriting, and increase ability to multitask. / Dissertation/Thesis / Masters Thesis Exercise and Wellness 2015

abstract: Poor executive cognitive functioning (ECF) is associated with a variety of alcohol-related problems, however, it is not known whether poor ECF precedes the onset of heavy drinking. Establishing the temporal precedence of poor ECF may have implications for our understanding of the development of Alcohol Use Disorder (AUD). The present study tests associations between early-adolescent ECF and young-adult risky drinking and alcohol-related problems in a prospective study of youth followed to young adulthood. Participants completed three ECF tasks at ages 11-14 and reported on their risky drinking and alcohol-related problems at ages 18-24. A latent ECF factor was created to determine whether early-adolescent ECF was associated with drinking outcomes after controlling for relevant covariates (e.g., age, sex, family history of AUD). Early-adolescent ECF, as measured by a latent factor, was unrelated to young-adult alcohol misuse and alcohol-related problems. However, sensitivity analyses revealed that an individual ECF task tapping response inhibition predicted young-adult peak drinks in a day. Present findings suggest that ECF is not a robust predictor of risky drinking or alcohol-related problems, and that this relation may be specific to the ECF component of response inhibition. / Dissertation/Thesis / Masters Thesis Psychology 2017

Objective: It is thought that executive functions (EF) emerge as outcomes of interactions between cognitive and emotional processes. They are an integral component of the growing regulatory abilities of children and adolescents and are important for academic success, attainment of social competence, and psychological development, among others. It is essential to evaluate them during neuropsychological assessment. However, they are difficult to capture with performance-based, neuropsychological assessment tools. These were once considered ‘gold standard’ measurements of EF but have been critiqued for a number of reasons. As such, rating scales have been useful as a complementary, perhaps eventual alternative, to performance-based tests. Behavioural screeners have high replicability, making them practical for use across various populations, and to evaluate everyday behaviours. A four-factor executive function screener derived from the Behavior Assessment System for Children (BASC) was previously developed and validated in a variety of age ranges and groups (Garcia-Barrera et al., 2011). However, with the exception of children with ADHD, the effectiveness of the screener has not been examined in individuals with neurologic disorder. In this population, EF are often impaired, due to delays or disruptions in normal brain development. Given these challenges in this population, this study 1) derived a similar screener for use in adolescents with neurologic disorder, using the second edition of the BASC, and 2) evaluated it against a commonly used EF rating scale [i.e., the Behavior Rating Inventory of Executive Function (BRIEF)] as well as performance-based executive function measures. Thirdly, this study characterized the nature of EFs in this clinical population, given that EF deficits are often central characteristics in many neurological disorders. Participants and Methods: An archival analysis was conducted with 107 neurologically-affected adolescents seen for neuropsychological assessment at Queen Alexandra Centre for Children’s Health. Patients were included in the study if they gave consent, had at least low average intellectual functioning, had a BASC-2 completed by a parent, and were between the ages of 12-18 years. Confirmatory factor analysis was used to evaluate the derived screener. Bivariate correlation analyses were used to evaluate convergent validity. To characterize the nature of this sample’s EF profiles, differences among groups were measured in a profile analysis via multivariate analysis of variance. Results: The four-factor model, as measured by the BASC-2 EF screener, fit the data most optimally, indicating that the structure of EF reflects the four-factor model observed in other studies. Consistent with other studies, convergent validity was observed with the BRIEF but not the performance-based tasks. Profile analysis indicated that there were some overall differences among the neurological groups and their BASC-2 scores as well as individual differences on the various factor scores. Conclusions: These findings support the four factor model measured by the screener in adolescents with neurological disorders. Given the consistency between the factor structure in this population and previous studies measuring this screener in healthy populations, and the convergence of the screener and the BRIEF, these findings contribute to the body of literature supporting this executive functioning screener as a complement to performance-based tasks. / Graduate / 2018-09-18

archives@tulane.edu / Musical experience is associated with a host of benefits to self-regulatory processes across multiple psychological domains. The purpose of the studies presented in this dissertation was to examine relationships between musical experience and cognitive, emotional, and physiological self-regulation. Cognitive regulation was measured with tasks of executive functions; emotional regulation was measured by self-efficacy, incidences of mental illness, depressive symptoms, and perceived chronic stress; and physiological regulation was measured by cortisol levels in response to an acute psychological stressor. Findings on cognitive regulation showed that enrollment in music programming during childhood was associated with enhanced working memory maintenance and updating, and musical experience in early adulthood was associated with enhanced cognitive flexibility. Among musically experienced adults, the ability to create a four-part harmonization was also associated with enhanced cognitive flexibility. With respect to emotional regulation, continued enrollment in music programming was associated with higher regulatory self-efficacy in children, and musically trained adults demonstrated lower incidences of mental illness, depressive symptoms, and perceived chronic stress. No physiological differences were found in acute cortisol reactivity between musicians and non-musicians, despite lower levels of perceived chronic stress in musicians. Taken together, these results suggest that cognitive and emotional self- regulation are impacted by music training, but not physiological regulation. However, divergent findings may depend on the type of musical experience measured, and the age of musical engagement. / 1 / Jenna Winston

While Attention-deficit/hyperactivity disorder (ADHD) remains one of the most common psychological disorders diagnosed, current understanding of the disorders expression and factors contributing to impairment in early adulthood remains limited. In an effort to better understand current issues with ADHD assessment and treatment in emerging adults, this study aimed to examine relationships between symptoms, executive function (EF), sleep, and impairment. Overall results of this study indicate that together, ADHD symptoms, EF, and sleep account for a significant proportion of variance in impairment. Additionally, results indicate that EF moderates the relationship between ADHD symptoms and impairment, and that sleep may be a protective factor for adults. Specifically, this study found that when compared to individuals reporting more sleep problems, the effect of ADHD symptoms and EF on impairment was much weaker among individuals reporting fewer sleep problems. Understanding the relationship between ADHD symptoms, EF, and sleep is critically important in better understanding adult ADHD and in informing assessment and treatment strategies to more effectively reduce impairment.

No description available.

Child maltreatment impacts approximately one in seven children in the United States, leading to many adverse outcomes throughout life. Adolescence is a time period that is critical for the development of self-regulation, as it is when the prefrontal cortex is actively developing. Existing research demonstrates the numerous adverse effects maltreatment may have on self-regulation, which encompasses executive function and emotion regulation abilities. However, there is little research examining how abuse and neglect may differently affect the developmental trajectories of executive function and emotion regulation throughout adolescence and into young adulthood. In the current study, 167 adolescents participated approximately annually at six time points, from ages 14 to 20. At each of the six time points, adolescents completed three executive function tasks as well as self-report questionnaires on their emotion regulation abilities and strategies. Information on maltreatment experienced from ages 1 to 13 was collected when the adolescents were approximately 18 to 20 years of age. Conditional growth curve models were utilized to test the differential effects of abuse and neglect on the growth trajectories of executive function abilities and emotion regulation difficulties and strategy use. The results revealed that neglect was associated with developmental changes in working memory abilities, such that greater amounts of neglect were associated with slower increases in working memory abilities across ages 14 to 20. Further, abuse was associated with developmental changes in difficulties in emotion regulation abilities, such that greater amounts of abuse were associated with larger increases in difficulties in emotion regulation abilities from ages 14 to 20. Finally, neglect was associated with the initial level (at age 14) of difficulties in emotion regulation abilities, such that greater levels of neglect were associated with higher initial levels of difficulties in emotion regulation abilities as compared to individuals with lesser amounts of experienced neglect. These findings suggest that working memory development during adolescence into young adulthood may be more vulnerable to childhood neglect and that both abuse and neglect in childhood may have adverse impacts on the development of emotion regulation abilities. / M.S. / Child maltreatment impacts approximately one in seven children in the United States, leading to many adverse outcomes throughout life. Adolescence is a time period that is critical for the development of self-regulation, which encompasses executive function and emotion regulation abilities. Existing research demonstrates the numerous adverse effects maltreatment may have on self-regulation. However, there is little research examining how abuse and neglect may differently affect the developmental trajectories of executive function and emotion regulation throughout adolescence and into young adulthood. In the current study, 167 adolescents participated approximately annually at six time points, from ages 14 to 20. At each of the six time points, adolescents completed three executive function tasks as well as self-report questionnaires on their emotion regulation abilities and strategies. Information on maltreatment experienced from ages 1 to 13 was collected when the adolescents were approximately 18 to 20 years of age. The results revealed that greater amounts of neglect were associated with slower increases in working memory abilities across ages 14 to 20. Further, greater amounts of abuse were associated with larger increases in difficulties in emotion regulation abilities from ages 14 to 20. Finally, neglect was associated with difficulties in emotion regulation abilities at age 14, such that greater levels of neglect were associated with higher levels of difficulties in emotion regulation abilities at age 14 compared to individuals with lesser amounts of experienced neglect. These findings suggest that working memory development during adolescence into young adulthood may be more vulnerable to childhood neglect and that both abuse and neglect in childhood may have adverse impacts on the development of emotion regulation abilities.

Hemispherectomy has gained widespread endorsement as a useful technique for treating seizures in patients with cerebral hemispheric dysfunction. Following this procedure, most patients experience seizure-freedom or a substantial decrease in the number of seizures occurring. Regarding other areas of functioning, patients generally maintain the same level of intelligence, language abilities, motor functioning, and visual ability, and experience improvements in behavioral disturbances and social skills. However, the current outcome literature lacks information regarding the effect of hemispherectomy on executive function. The purpose of this study is to evaluate executive function in pediatric patients with intractable epilepsy following a hemispherectomy. The parents of children who had undergone this surgical intervention completed the Behavior Rating Inventory of Executive Function (BRIEF; Gioia, Isquith, Guy, and Kenworthy, 2002) and their children's scores were compared to those of children with epilepsy treated with anticonvulsant medications (AEDs) only. The impact of clinical variables (i.e. age at time of surgery, lateralization of hemispherectomy, and amount of time since surgery) on BRIEF scores were also examined. Results indicated that children undergoing a hemispherectomy produced lower scores (less impaired) on several of the BRIEF scales as compared to those taking AEDs only. The left and right hemispherectomy group differed only on a subscale measuring behavioral inhibition, with the right hemispherectomy group producing a higher mean (meaning more impairment). Several BRIEF scores in the aggregate hemispherectomy group were positively correlated with time since surgery, such that longer post-operative periods were associated with poorer performances on the BRIEF. Several BRIEF measures were negatively correlated with age at time of surgery, suggesting that younger patients fared worse on the BRIEF than older patients.

Recent research has suggested possible relationships between neuropsychological functioning and belief in superstitious and paranormal phenomena. The prefrontal cortex is of particular interest in this regard, as executive function and the mechanisms associated with faulty reasoning ability may maintain superstitious and supernatural beliefs. The present study investigated the relationship between executive function and superstitious and paranormal beliefs, in order to examine the extent to which the executive function abilities of individuals who subscribe to such beliefs differs from that of individuals who do not believe in such phenomena. The sample consisted of 43 male and female university students, between the ages of 21 and 28, from various ethnic groups. A non-experimental, cross-sectional, between-subjects, correlational mixed methods design was employed. Quantitative data was collected using a demographic questionnaire, a Modified Paranormal Beliefs Scale, the Neuroticism subscale of the NEO PI-R and an executive function and logical reasoning test battery. Qualitative data was collected by means of interviews. Few significant correlations were found between demographic variables and superstitious and paranormal beliefs, Neuroticism and executive function scores respectively. Relationships between Neuroticism and superstitious and paranormal beliefs were minimal. Both positive and negative correlations were found between superstitious and paranormal beliefs and executive function scores, suggesting that other neuropsychological factors may underlie illogical beliefs. Qualitative data revealed that superstitious and paranormal beliefs were perpetuated because of their links to familial environment and culture and beliefs assisted individuals in managing anxiety about the unknown by instilling a sense of control over the future. These results suggest that other neuropsychological mechanisms, such as emotion, may play a more significant role than executive function in superstitious and paranormal beliefs.